Smelly Alley

Why is it alley ways always smell? I probably can guess but I don't understand. In fact the older I become the less I understand the human race.

Captured this on the way to my dental check up, didn't need anything again and another "excellent hygiene" report for me. Aiden will be referred for an appointment with the Orthodontist about possibility of braces, so she's been out on waiting list.